2000 Accord, F23 engine with F23 transmission.

I'm running a heavy pressure plate which puts a high load on the clutch hydraulic system. After driving the car into town for a short while, the system doesn't fully disengage the clutch any more, making it difficult to get into and out of gears. It gets worse the longer I drive, but returns to working just fine after the car sits for a few hours and cools.

Is there a more robust alternative available; maybe a retrofit from another vehicle, or aftermarket cylinder? I might consider something with slight modifications or converting to a pull-type system if it helps.